Biology, 31.01.2020 02:50 hsjsjsjdjjd
The essential difference between an experiment and an observational study is that a. observational studies always involve large numbers of subjects, but experiments never dob. in an experiment, information is gathered only on animals or things, but in an observational study, only information about people is gatheredc. an experiment imposes treatment on the subjects, but an experiment does not
d. an observational study imposes treatments on the subjects, but an observational study does not
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Select the correct answer from each drop-down menu. in an experiment, dr. travis examined the effects of calcium intake on osteoporosis, a condition that causes an increased risk of bone fractures. the amount of calcium is variable. the risk of bone fractures .
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Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation
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What is the problem in this article? what solution does the article propose?
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The essential difference between an experiment and an observational study is that a. observational s...
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